Truly, Adventures Dark and Deep is a step forward and a superb product. While the evolution and changes of AD&D to ADD is often subtle, the rules are smoother and much more playable for newer people. If you're not a newer player to Advanced Dungeons & Dragons, then ADD will run beautifully and gel perfectly with your current game. Even in playtest form it's definitely a massive step forward, if you know where to look within for where the developments are. It can only get better going forward.

Didn't see any difference between this and the original DMG. If you can't find the 3 original core books, this one is pretty much the same thing to get you started; but I didn't see how it was a continuation of Mr. Gary's work.

This series does indeed remind me of AD&D cerca Unearthed Arcana, but I find it hard to believe that ole Gary would have maintained the descending armor class and attack tables. These never made much sense and are only useful in terms of nostalgia, not actual play. My suggestion is the inclusion of an accending armor class and to- hit bonus option similar to those found in Swords & Wizardry.